Driving mechanism for stoker-boxes.



B. C. STEWART. DRIVING MECHANISM FOR STOK ER BOXES.

APPLICATION FILED JAN. 16, 1914.

Patented Aug. 10, 1915.

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1,149,416, Patented Aug. 10, 1915.

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. UNTTEED STATES PATENT QFFTCE.

BURT C. STEWART, OF DETROIT, MICHIGAN, ASSIGNOR TO MURPHY IRON WORKS, OFDETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

DRIVING MECHANISM FOR STOKER-BOXES.

Specification of Letters Patent.

Application filed January 16, 1914. Serial No. 812,564.

nism for stokers, and more particularly to a variable speed drive forstoker boxes, which permits of the stoker boxes at one end of a furnacebeing moved at a different speed from the stoker boxes at the other endof the furnace.

It is a well known fact that fuel is consumed with greater rapidity atthe rear end ofa combustion chamber or fire box than at the forward endthereof, consequently it is necessary to operate the stoker boxes at therear end of a furnace more often than at the forward end, whereby agreater amount of fuel will be automatically fed into the furnace. Topermit of the stoker boxes at the rear end of the furnace beingautomatically operated independently of the stoker boxes at the forwardend of a furnace, I have devised a driving mechanism which permits ofeither set of stoker boxes being thrown out of operation or permits ofeither set being manually actuated independent of the .automatic drive.l

The driving mechanism will be herein after specifically described andthen claimed, and reference will now be had tothe drawings, whereinFigure 1 is a front elevation of a furnace provided with'a drivingmechanism for the stoker boxes thereof; Fig. 2 is an enlargedlongitudinal sectional view of a portion of the driving mechanism; Fig.3 is a front elevation of the same partly brdken away and partly insection, and Fig. 4 is a plan of a portion of the driving mechanism. Indescribing my invention by aid of the drawings above referred to Idesire to point out that I intend said views as merely illustrative ofan examplewhereby my invention may be applied in practice, and I donotlimit my claims to the precise arrangement and construction. of.parts indicated. The following description is therefore to be construedbroadly as including substitute arrangements and constructions which arethe obvious equivalent of those shown.

Patented Aug. 10, 1915.

In the drawing, 1 denotes the front wall of the furnace of that typecommonly known as the side over feed, wherein inclined stationary andmovable grate bars 2 receive fuel from coking plates 3 and fuelmagazines 4, the fuel being automatically fed by stoker boxes 5. Thestoker boxes '5 are provided with racks 6 and engaging said racks aresegment gears 7 and 8, the former being mounted upon'a sleeve 9 and thelatter upon a shaft 10, said sleeve and said shaft extending through thefront wall 1 ofthe furnace. The shaft 10 protrudes beyond the end of thesleeve 9 and is provided with a rectangular shank 11 upon which there ismounted a circular head 12. The head 12 has the periphery thereofprovided with a notch 13 and the front side of said head has a neck 14and a rectangular shank 15, said hub portion 18 of a lever 19 and saidhub portion has a radially disposed bearing 20, the purpose'of whichwill presently appear. Mounted upon the outer end of the sleeve 9 andconfronting the head 12 is a head 21 having the periphery thereofprovided with a notch 22. The head 21 also has a neck 23 an-dlooselymounted upon said neckis the- 20 of the lever 19. The bearings 20 and 26r a:

are connected by a bolt 27 and a nut 28, said boltserving as a pivot pinfor dogs 29 and 30 adapted to engage in the notches 13' and 22respectively.

The periphery of the head 21 is provided with a seriesof teeth or a rack31 and meshing with said rack is a gear 32 rotatably mounted upon a studshaft or pin 33, supported byv the front wall 1 of the furnace. Thesector gear 32 has a rectangular shank 34:, the purpose of which willhereinafter appear. v

The lower ends of the levers 19 and 25 are longitudinally slotted, as at35 and connected by an adjustable bolt 36, which has the threaded endthereof provided with a nut 37 having a handle or crank 38 that permitsof the bolt 36 being rapidly adjusted relatively to the levers 19 and25. Arranged upon the bolt 36, between the levers 19 and 25 is arotatable spacing sleeve 39 and engaging said sleeve is the hook-shapedend of a link 40 pivotally connected, as at 11 to.

the end of a connecting bar 42. The connecting bar 42 is slidablymounted in brackets 01* straps 43carried by the front wall of thefurnace and said connecting bar permits of the stoker boxes atone sideof the furnace being operated in unison With the stoker boxes at theopposite side thereof.

Associated with the connecting bar 42 are connections generallydesignated 44, these connections being of the ordinary and well knowntype employed for; operating the movable grate bars and the clinkergrinder of the furnace.

-' bar 42. a

When the connecting bar 42 is recipro- Arranged at one side of thefurnace is an engine or motor driven shaft having one of. the drivenwheels 16 thereof provided with a wrist pin 47. This wrist pin sup portsone end of a'pitman. 48 that is pivotally connected, as at 49 to theconnecting cated, an oscillatory movement is imparted to the levers 19and 25, and with the dogs 29 and 30 inengagement with the heads 12 and,21, the sleeve 9 and the shaft 10 are rocked to impart a reciprocatorymovement to the stoker-boxes 5 through the medium of the racks 6 and thesegment gears 7. z When it is desired to operate one set of stoker boxesthat is, the boxes either at the front or rear end of a furnace, one ofthe dogs 29 or 30 can be thrown out of engagement with one of the heads12 or 21 whereby the hub portion of one-of the levers is free tomoveupon the neckof the head with which it is associated. It istherefore possible to rock thesleeve 9 or the shaft 10 and should it benecessary to manually rock either the sleeve-9 or theshaft 10 a wrenchor other suitable instrument can be placed upon either of. the shanks 15or 34, the latter imparting movement to the sleeve 9 and the formermovement to the shaft 10. It is necessary to provide the rack 31 and theand 25 it is necessary From the-foregoing it will be observedspacensleeves 39, and since it is practically.

that the elements 40'to 49 inclusive constitute automatic meansforimparting moveis through the medium of the above mentioned means thatthe speed at which'the stoker boxes push the coal into the grates canbeeasily regulated to conform with the duty required.

What I claim is z 1. In a driving mechanism for stoker boxes,r thecombination with a shaft and sleeve adapted to impart movement to stokerboxes, of means having connection withsaid sleeve and said shaft wherebyone can be rocked independently of the other.

2. In a driving mechanism for stoker boxes, the combination with a shaftand sleeve adapted to impart movement to stoker boxes, of means havinconnection with said sleeve and said sha t whereby one can be rockedindependently of the other, and means ,'to facilitate manually rockingsaid shaft and said sleeve independently of said means.

3. In a driving mechanism for stokerboxes, a shaft adapted to impartmovement to one set of boxes, a sleeve arranged upon said shaft andadapted to impart movement to another set of boxes, confronting headsmounted upon said shaft and said sleeve, and means capable of rockingone head independently of the other'head.

4. In a driving mechanism for stoker boxes, the combination with a shaftand a sleeve adapted to impart movement to stoker boxes, of a headcarried by said sleeve, a head carried by said shaft, levers looselysupported by said'head, means adapted to oscillate said levers, saidlevers relatively to said heads.

5. In a driving mechanism for stoker boxes, the combination with a shaftadapted to impart movement to stoker boxes, a sleeve arranged upon saidshaft and adapted to impart movement to stoker boxes, a head and meansfor fixing fixedupon said sleeve, a head fixed upon said shaft andconfronting the head of said sleeve, oscillatory levers looselysupported by said heads and capable of being fixed relatively to eitherhead, and means to fa cilitate manually rocking said head independent ofsaid levers.

6. In a variable speed drive for stoker boxes, a sleeve adapted toimpart movement to one set of boxes, a shaft extending through saidsleeve and adapted to impart movement to another set of boxes,oscillatory levers loosely supported relatively to said shaft and saidsleeve and capable of imparting a rocking movement to said shaft I 'andsaid sleeve, and means for controlling the operation of said leversrelatively to said shaft and said sleeve.

7. In a variable speed drive for stoker boxes, a sleeve adapted toimpart movement to one set of boxes, a shaft extending through saidsleeve and adapted to impart movement to another set of boxes,oscillatory levers loosely supported relatively to said shaft and saidsleeve and capable of im: parting a rocking movement to said shaft andsaid sleeve, means for controlling the operation of saidleversrelatively to sald of boxes, of a head mounted upon said sleeve,

- a head mounted upon said shaft, oscillatory levers loosely supportedby said heads, dogs.

supported by said levers and adapted to be manually thrown intoengagement with said heads, and means to facilitate manually rockingsaid shaft and said sleeve independently of said oscillatory levers.

9.- In a variable speed drive for stoker boxes, the combination with afurnace having stoker boxes, of confronting heads supported at thefront. wall of said furnace and adapted to be oscillated to impartmovement to the stoker boxes of said furnace, levers supported by saidheads, and means for independently fixing said levers relatively to saidheads.

10. In a driving mechanism for stoker boxes, the combination with asleeve adapted to impart movement to one set of stoker boxes, a shaftextending through said sleeve adapted to impart movement to another setof stoker boxes, a head mounted upon said sleeve, a head mounted uponsaid shaft and provided with a shank, a rack forming part of the head ofsaid sleeve, a sector gear engaging said rack and adapted to facilitatemanually rocking said sleeve, oscillatory levers loosely supported bysaid heads, and.

dogs supported by said levers and capable of being thrown into and outof engagement with said heads whereby either of said heads can be rockedby said levers.

In testimony whereof I afilx my signature in presence of two Witnesses.

BURT o. STEWART.

Witnesses:

LEWIS E. FLANDERs, ANNA M. Donn.

